Ventilation latch for window sashes



1,603,614 N. A. LEREN VENTILATION LATCH FOR WINDOW SASHES Filed Jan. 13, 1923 A -W 1W W x ,6

INVEIY 701?.

Patented Oct. 19, 19216.

tlhli'l'rEll teeter VENTILATION LATCH FOR VJINDOVI SASI-IIES.

Application filed January 18, 1923. Serial No. 612,376.

It is an object of this invention to provide a simple and highly eflicient ventilation latch tor window sashes by which the sashes may be locked in various open positions.

It is an additional object to devise a ventilation latch, which may be easily operated from the window casing.

A further object 0'! this invention is to provide a latch of this kind, wherein the complete structure, except a. small operating handle is entirely obscured trom view.

The invention is illustrated in the accompanying drawings, in which Fig. l is a fragmentary view of the front elevation of a window with the ventilation latch installed;

Fig.2 is a horizontal section looking in the direction of the arrows taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary side elevation on an enlarged scale of one of the sashes;

Fig. 4 is a horizontal section taken on the line 4% of Fig. 3;

F 5 is a rear elevation on an enlarged scale of the ventilation. latch detached;

6 is vertical section taken on the line 6-6 of Fig. 5; and

Fig. 7 is a horizontal section taken on the line 7-7 of Fig. 5.

Referring to the drawings. m, y and 2 refer, frame, the inner casing, and the upper and lower sashes of the ordinary window structure.

A housing, preferably of thin metal. comprising a -lace plate 8 and a U-shaped sup porting member 9 secured thereto, is inset at one side of the window frame at the jointure of the two sashes. the plate 8 being the letters 7.0.

flush with the surface of the window trame.

The hole necessary for the installation ot this housing may be cut with a keyhole saw on the ordinary window frame, or the recess may he made at the mill during the process out manufacture of the frame.

In the adjacent edge of each sash. a looking rack 10 is also inset, lying flush with the edge surface of the sash.

Two locking dogs 11, in reverse arrangement, are pivoted to a small shatt 12, which is supported by the face plate and the U- .respectively, to the window' shaped member 9. These locking dogs are in the form oi. levers having locking ends 11, for engagement with the locking racks on the sash edges and lever ends 11", the

purpose oi which we shall presently see- Apertures 13 are cut in the Face plate 8 to allow the dogs 11 to proieet out of the housing into engagement with the co-operating racks 10. Small springs 14, attached to the plate 8. work underneath the lever ends 11" ot the dogs to actuate the se me into engagement.

A disc 1 having two profile cams 15". is pivoted to the under side of the U-shaped member. tor engagement with the lever ends of the dogs 11, and is operative when rotated. to disengage the locking dogs 11 and retract them into their housing. An arm 16. on said disc 15. is connected by a suit-- able connection 17 passing through the window casing m to an operating handle 18. and which may be manipulated on the casing in the room.

The operation of the applieants invention is probably obvious from this description.

During the daytime or when the window is wished to he left unlocked. the operating handle 18 is pulled out, disengaging the locking dogs and leaving the sashes tree to he raised or lowered. hen it is wished to lock the sashes. the sashes are raised to the desired positions and the operating handle 18 is pushed in, releasing the spring-pressed dogs. which immediately engage with the locking): racks on the sashes. The sashes cannot then be further opened from the outside, and due to the position of the operating handle, a burglar could not thrust his arm within the window to release the lock. The sashes. however, may be closed without touching the operating handle. This is convenient, it the windows are wished to be closed at any time during the night.

The pivoted locking dogs 11 are shown having triangular-shaped locking ends 11 for registration with the racks 10, but it is understood these dogs be of any suitable shape as long as they engage said racks.

For example, rectangular tongues or pivoted holts might be used in place of the triangular locking ends.

V sashes carrying a From the above description, it is apparent that applicant has provided an extremely simple and efficient device for positively locking window sashes in various desired open positions.

It will, of course, be understood that various changes may be made in the form, details and arrangement of parts of the applicants structurewithout departing from the scope of the invention, which, generally stated, consists in the matter shown and. described and set forth in the appended claims.

Vhat I claim is 1. The combination with a window frame and upper and lower sashes, of a ventilation latch con'iprising a housing inset on one side of said window frame, a pair of spaced locking members pivoted withinsaid housin one of said locking-members adapted I to engage the adjacent edge of said upper sash, and the other said locking, member adapted toengage the. adjacent edge of said lower sash, and a member" pivotally mounted in the back of said housing carrying a pair of spaced profile cams. engageable respectively with said locking members to with draw the same. from engagement with said sashes.

2. The combination with a window frame and a: pair of sliding sashesof a ventilation latch comprising a housing inset on one side of said window frame, locking racks on the two adjacent longitudinal edges of said sashes, a pair of spaced locking dogs pivoted within said housing and normaily engaging, respectively, the racks on said sashes to lock the same in any open position against further opening and a disc mounted in said housing rotatable in aplane parallel to the longitudinal edges of said sashes carrying a pair of spaced profile cams engagea-ble, respectively, with said locking dogs to withdraw said dogs from engagement with said locking racks on saidsaslies.

3. The combination with a window frame and a pair of sliding sashes of'a ventilation latch comprising a housing inset on one side of said window frame, locking racks on the adjacent longitudinal edges of the sashes, a pair of spaced spring-pressed loci.- ing dogs in the form of lovers pivoted ,in said housing, having their locking ends 61(- tending in opposite directions one of which normally engages the locking rack on said lower sash to prevent it from being further raised and the other of which normally engages the locking rack on said, upper sash to prevent further lowering and a disc within said housing rotatable in a plane pair of spaced profile cams engageable, respectively, with the two lever heads of said dogs to withdraw said from engagement with said locking racks on said sashes.

parallel to the longitudinal edges of said 4. The combination with a window frame and a pair of sliding sashes of a ventilation latch comprisin a housing inset on one side of said winc ow frame, and including a Ushaped member, a pair of spaced locking dogs pivoted within said housing and normally engaging, respectively said sliding sashes, a member pivoted within said housing to the central portion of said U-shaped member and carrying spaced means adapted to engage, respectively, said locking dogs to withdraw the same from engagement with said sashes.

5. The combination with a window frame and a pair of sliding sashes, of a ventilation latch comprising a housing inset on one side of said window frame; a pair of pivoted locking dogs in said housing each normally engaging the adjacent longitudinal edge of one of said sashes to hold thesame locked in any open position against further opening, a disc mounted in said housing rotatable in a plane parallel to the longitudinal edges of said sashes carrying a pair of profile cams engageable with said locking dogs to disengage said dogs from the adjacent edges of said sashes, flexible connection attached at one end to a point near the periphery of saiddisc and extending'in a line. parallel to the plane of said disc through the room side of said window casing and a handle secured to the free end of said flexible connection by which the rotation: of said disc may be controlled.

6.. The combination with a window frame and a pair of sliding. sashes, of a ventilation latch comprising a face plate set flush with the outer surface of one side of said window frame, a l-shaped supporting member fastened thereto/and inset within said window frame, locking racks set flush'with the adjacent longitudinal edges of said window sashes, a pair of pivoted locking dogs carried by said faceplate, in the: form of? levers their locking ends adapted to be rely projected irto ei'igagement with locking racks when the sashes are opened and with their lever ends projecting in the path of a pair of profile cams depending from a: disc pivoted to the under side of said Ushaped member, and a. means of rotating said cams to disengage said dogsfrom said racks to allow the sashes to be raised or lowered.

'Z. The. combination with a window frame and pair of sliding sashes, of a ventilation latch comprising a face plate set flush with the outer surface of-one side of said window frame, a U-shaped supporting member fastened thereto and inset within said window frame, locking racks set flush on the, ad jacent longitudinal edges of said. window sashes, a pair of lockingdogs pivoted on a small shaft carried by said face plate and U-shapcd member, said locking dogs being in the form of levers with their locking ends adapted to be projected into engagement with said locking racks by means of small springs and their lever ends projecting in the path of a pair of profile cams depending from a disc pivoted to the under side of said U-shaped member, and a means for rotating said cams operable from the room side of the Window casing for the purpose of disengaging said locking dogs to allow 1 the sashes to be raised or lowered.

In testimony whereof I affix my signature.

NELS A. LEREN. 

